/Engine/Plugins/Experimental/UIFramework/Source/Public/Types/UIFWidgetTree.h
Find the widget by its unique Id. The widget needs to be in the Tree.
const [UUIFrameworkWidget](API\Plugins\UIFramework\UUIFrameworkWidget) * FindWidgetById ( [FUIFrameworkWidgetId](API\Plugins\UIFramework\Types\FUIFrameworkWidgetId) WidgetId ) const